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1c0c13eb AJ |
1 | /* |
2 | * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | * | |
9 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
10 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
11 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
12 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
13 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
14 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
15 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
16 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
17 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
18 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
1c0c13eb AJ |
25 | #include <linux/init.h> |
26 | #include <linux/ssb/ssb.h> | |
27 | #include <asm/time.h> | |
28 | #include <bcm47xx.h> | |
8eae19cc | 29 | #include <bcm47xx_board.h> |
1c0c13eb | 30 | |
4b550488 | 31 | void __init plat_time_init(void) |
1c0c13eb | 32 | { |
08ccf572 | 33 | unsigned long hz = 0; |
2224de9d HM |
34 | u16 chip_id = 0; |
35 | char buf[10]; | |
36 | int len; | |
8eae19cc | 37 | enum bcm47xx_board board = bcm47xx_board_get(); |
1c0c13eb AJ |
38 | |
39 | /* | |
40 | * Use deterministic values for initial counter interrupt | |
41 | * so that calibrate delay avoids encountering a counter wrap. | |
42 | */ | |
43 | write_c0_count(0); | |
44 | write_c0_compare(0xffff); | |
45 | ||
08ccf572 | 46 | switch (bcm47xx_bus_type) { |
a656ffcb | 47 | #ifdef CONFIG_BCM47XX_SSB |
08ccf572 HM |
48 | case BCM47XX_BUS_TYPE_SSB: |
49 | hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2; | |
2224de9d | 50 | chip_id = bcm47xx_bus.ssb.chip_id; |
08ccf572 | 51 | break; |
c1d1c5d4 HM |
52 | #endif |
53 | #ifdef CONFIG_BCM47XX_BCMA | |
54 | case BCM47XX_BUS_TYPE_BCMA: | |
55 | hz = bcma_cpu_clock(&bcm47xx_bus.bcma.bus.drv_mips) / 2; | |
2224de9d | 56 | chip_id = bcm47xx_bus.bcma.bus.chipinfo.id; |
c1d1c5d4 | 57 | break; |
a656ffcb | 58 | #endif |
08ccf572 HM |
59 | } |
60 | ||
2224de9d HM |
61 | if (chip_id == 0x5354) { |
62 | len = bcm47xx_nvram_getenv("clkfreq", buf, sizeof(buf)); | |
63 | if (len >= 0 && !strncmp(buf, "200", 4)) | |
64 | hz = 100000000; | |
65 | } | |
66 | ||
8eae19cc HM |
67 | switch (board) { |
68 | case BCM47XX_BOARD_ASUS_WL520GC: | |
69 | case BCM47XX_BOARD_ASUS_WL520GU: | |
70 | hz = 100000000; | |
71 | break; | |
72 | default: | |
73 | break; | |
74 | } | |
75 | ||
1c0c13eb AJ |
76 | if (!hz) |
77 | hz = 100000000; | |
78 | ||
79 | /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */ | |
80 | mips_hpt_frequency = hz; | |
81 | } |